useful adj. 1.有用的,有益的,有效的,有帮助的。 2.〔俚语〕值得称赞的,精通…的 (at)。 make oneself generally useful 事事有用,事事帮得来忙 (He must make himself generally useful. 他可事事都干得来)。 a pretty useful performance 相当精采的演出。 His wife is very useful at cooking. 他的妻子很会做菜。 adv. -ly ,-ness n.
Many species are abundant enough to be utilised as a source of meat , skins , and other useful animal products 很多动物资源十分丰富,可以用来制作肉类、皮毛及其它有用的动物产品。
The earthworm is a useful animal . on the ground it is food for other animals . under the ground , it makes rich soil for fields and gardens 蚯蚓是一种有益的动物。在地面上它是其他动物的食物。在地下,它为田园和花园制造肥沃的土壤。